Carriage for polishing machines



w. H. GRANT Feb. 1 1927.

CARRIAGE FOR POLISHING MACHINES.

Filed Dec. 8. 1924 I INVENTOR.

Patented Feb. 1, 1927.

WILLIAM H. GRANT, OF MILXVAUKEE. WISCONSIN.

CARRIAGE FOR POLISHING- MACHINES.

Application filed December 8, 1924..

This invention relates to improvements in carriages for polishingmachines, more particularly for use with polishing machines forautomobile bumper bars and the like.

It is one of the objects of the present invention to provide a carriageof the class described arranged so that its level may be varied bypressure on one edge to automatically compensate for irregularities onthe surface of the bumper bar carried thereon, or unevenness of thepolishing wheel acting on the bar, whereby the entire surface of the barwill be evenly and uniformly polished.

A further object of the invention is to provide a carriage of the classdescribed having its frame seated on springs in order that the entiresurface of a bar carried by the carriage will be urged into contact witha polishing wheel.

A further object of the invention is to provide a carriage for polishingmachines shaped and adapted to carry bumper bars, the bars being easilyand quickly positioned thereon and removed therefrom.

A further object of the invention is to provide a wheeled carriage forpolishing machines, the carriage being adapted for longitudinal travelbeneath the grinding or polishing wheels of a polishing machine.

A further object of the invention is to provide a carriage of the classdescribed which is of very simple construction, is strong and durable,is efficient in operation, and is well adapted for the purposedescribed.

With the above and other objects in view the invention consists of theimproved carriage for polishing machines and its parts and combinationsas set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference charactersindicate the same parts in all of the views:

Fig. 1 is a fragmentary side view of the carriage;

Fig. 2 is a cross-sectional view thereof; and

Fig. 3 is a fragmentary plan view thereof.

Referring 110w more particularly to the drawing it will be seen that thenumeral 5 indicates the frame of the carriage, the same being formed ofan elongated U-shaped metallic bar having its end portions (not shown)bent to suit the particular shape of Serial No. 754,633.

the bumper which it adapted to carry. Intermediate the ends of theframe, supporting blocks 6 are fitted thereinto and the frame is held tosaid blocks by rivets or bolts 7. The lower face of each block hassecured thereto a plate 8, the plates being of greater width than theblocks and projecting outwarcuy from the sides the form flanges 9 andeach flanged portion is formed with a pair of slots 10.

An axle 11 is mounted below each block transversely to the frame and theblock and the frame are connected thereto by means of a pin 12 dependingfrom the plate 8 and passing through an aperture 13 in the axle. Pairsof coiled springs 14, seated in the recesses 15 in the axles, and oneach side of the pins 12 and connected to the plates 8, urge the blocksand frame upwardly from the axles and support the same thereabove.Transverse pins 16 in the lower ends of the pins 12 and collars l7theresurrounding prevent withdrawal of the depending members 1.2 fromthe apertures 13. Upstanding studs 18 are formed on the axles on eachside of the apertures 13 and engage the flange slots 10. The engagementof said studs with the edges of said slots prevents the carriage frameswaying and from moving laterally or longitudinally on the springs 14:,but the arrangement permits depression of one side of the carriage frameif there is undue pressure thereon.

The ends of the axles 11 are reduced, as at 19, to form hubs and wheels20 are mounted thereon and are held in place by cotter pins 21.

In use, the carriage is adapted to receive an automobile bumper bar orthe like to be polished, and the bar is slipped over the frame and heldthereon by any convenient means, the surface of the bar to be polishedbeing uppermost. The particular type of carriage here described isintended for use with polishing machines comprising a plurality ofalined units, each unit including a revolving polishing wheel, and thecarriage is caused to travel longitudinally and below the wheels, sothat the wheels revolve on and polish the bump-er carried by thecarriage. Obviously, the spring seating for the blocks 6 causes thebumper to be urged into contact with and held against the wheels. Shouldthere be an unevenness in the bump er surface or in a polishing wheel,the

springs permit a depression of one side of the carriage frame tocompensate for the irregularities which may occur, with the result thata smooth even polish on a bar will be obtained.

From the foregoing description itwill be seen that the improved carriagefor polishing machines is of very simple and novel construction, and iswell adapted for the purpose set forth.

Ys hat I claim as my invention is:

1. A device of the class described, comprising a pair of spaced-apartaxles having wheels mounted thereon, a frame carried by said axles,springs connected to said axles and to said frame for supporting theframe above s id axles, and'means formed on'said' axles and said frameto prevent longitudinal and side movement of the frame with respect tothe axles.

V 2. A device of the class described, comprising a pair of spacedapartaxles having wheels mounted thereon, a frame carried by said axles,springs connected to said axles and to said frame for supporting theframe above said axles, and pin and slot means formed in and on saidaxles and said frame permitting only vertical movement of the frame withrespect to the axles.

3. it carriage of the character described, comprising a pair ofspaced-apart axles formed with recesses therein, wheels being mounted onsaid axles, a frame mounted above said axles, springs seated in saidrecesses and connected to the frame for supporting the frame ab vs theaxles, and guard means on and in the frame and axles to prevent rockingor tilting of the frame.

4. A carriage of the character described, comprising a pair ofspaced-apart axles formed with transverse bores and top recesses on eachside of the bores, Wheels carried by said axles, a frame mounted abovethe axles and having depending pins entering the axle bores, springsseated in said axle recesses and connected to the frame for yieldinglysupporting the frame above the axles, and guard means on and in theframe and axles to prevent rocking or tilting of the frame.

A carriage for polishing machines, comprising a pair of spaced-apartaxles formed with transverse bores and top recesses on each side of thebores, wheels carried by said axles, a block mounted above each axle, anelongated frame of U-shape in cross-section supported by said blocksabove the axles and transversely thereto, said blocks being fitted intothe frame, plates connected to the bottoms of said blocks and havingside flanges formed with slots therein, a pin depending from each plateand entering the axle bores, springs seated in said axle recesses andconnected to the plates for yieldingly supporting the blocks and frameabove the axles, and pins projecting upwardly from said axles andengaging the slots in the side flanges of said plates.

In testimony whereof, I aflix my signature.

l/VILLIAM H. GRANT.

